轉載自：http://blog.csdn.net/typa01_kk/article/details/49057073
###########CentOS7下MySQL的卸載
1：查看MySQL是否安裝:
方式1:
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[root@localhost usr]# yum list installed mysql*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.yun-idc.com
* extras: mirror.neu.edu.cn
* updates: mirrors.yun-idc.com
Installed Packages
MySQL-client.x86_64 5.6.27-1.el6 installed
MySQL-devel.x86_64 5.6.27-1.el6 installed
MySQL-server.x86_64 5.6.27-1.el6 installed
[root@localhost usr]#
方式2( -i :不區分大小寫)：
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[root@localhost usr]# rpm -qa | grep -i mysql
MySQL-server-5.6.27-1.el6.x86_64
MySQL-client-5.6.27-1.el6.x86_64
MySQL-devel-5.6.27-1.el6.x86_64
[root@localhost usr]#
2：卸載MySQL:
卸載1：
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[root@localhost usr]# yum remove mysql mysql-server mysql-libs compat-mysql51
[root@localhost usr]# rm -rf /var/lib/mysql
[root@localhost usr]# rm /etc/my.cnf
如果裝了mysql-devel(其他一樣add command)，卸載爲：
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[root@Tony_ts_tian init.d]# yum remove mysql mysql-devel mysql-server mysql-libs compat-mysql51
注（例如）:
mysql-5.5.39-1.el6.remi.x86_64
mysql-libs-5.5.39-1.el6.remi.x86_64
compat-mysql51-5.1.54-1.el6.remi.x86_64
mysql-server-5.5.39-1.el6.remi.x86_64
卸載2{繼續，1，2選擇一種（此處爲介紹）：}:
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[root@localhost mysql]# rpm -aq | grep -i mysql
MySQL-server-5.6.27-1.el6.x86_64
MySQL-client-5.6.27-1.el6.x86_64
MySQL-devel-5.6.27-1.el6.x86_64
[root@localhost mysql]# rpm -e MySQL-server-5.6.27-1.el6.x86_64
[root@localhost mysql]# rpm -e MySQL-client-5.6.27-1.el6.x86_64
[root@localhost mysql]# rpm -e MySQL-devel-5.6.27-1.el6.x86_64
[root@localhost rc.d]# cd /var/lib/
[root@localhost lib]# rm -rf mysql/
注:刪除MySQL數據庫目錄(關鍵) ，否則password不更新（默認安裝，如果自定義安裝路徑和鏈接路徑ln -s ……請刪除。）
rm -rf /var/lib/mysql
卸載3：
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[root@localhost usr]# whereis mysql
mysql: /usr/lib64/mysql
[root@localhost usr]# rm -rf /usr/lib64/mysql
注：find / -name mysql
注：清空相關mysql的所有目錄以及文件和其他配置和設置等。如果有，則刪除。也必須考慮其他軟件不去影響。
rm -rf /usr/lib/mysql
rm -rf /usr/share/mysql
卸載4：
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[root@localhost usr]# rm –rf /usr/my.cnf
[root@localhost usr]# rm -rf /root/.mysql_sercret
卸載5（自啓服務）：
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[root@localhost usr]# chkconfig –list | grep -i mysql
[root@localhost usr]# chkconfig –del mysqld
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此處刪除看自己設置:mysql/mysqld